Floorboard sanding rexposed some woodworm tunnels

I have been sanding down the old floorboards in my 1899 house. In a
few places, the sanding has exposed some woodworm tunnels in the
timber. For example, in one room measuring 3m x 4.5m, there are four
places where I can see woodworm tunnels exposed in a small group.
Should I be woried? Most of the wood seems in excellent condition -
and of course, there is no telling how old the tunnels are... The
exposed tunnels are not near the ends of the boards. (If they were I'd
assume it was the less worrysome wood-boring weavil.)
When converting the attic earlier this year, I didn't find any
evidence of woodworm up there.
Thanks..
Frank

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